With the exception of one chapter, the present new edition is an unaltered reprint of the former edition. For one thing, I had no time for a thoroughgoing revision, although there was much in the presentation that I should have liked to alter. Besides I am under the obligation to prepare for the press the manuscripts which Marx has left, and this is much more important than anything else. Then again, my conscience rebels against making any alterations. The book is a polemic, and I think that I owe it to my adversary not to improve anything in my work when he is unable to improve his. I could only claim the right to make a rejoinder to Herr Dühring's reply. But I have not read, and will not read, unless there is some special reason to do so, what Herr Dühring has written concerning my attack [11] ; in point of theory I have :finished with him. Besides, I must observe the rules of decency in literary warfare all the more strictly in his regard because of the despicable injustice that has since been done to him by the University of Berlin. It is true that the University has not gone unpunished. A university which so abases itself as to deprive Herr Dühring, in circumstances which are well known, of his academic freedom [12] must not be surprised to find Herr Schweninger forced on it in circumstances which are equally well known.
The only chapter in which I have allowed myself some additional elucidation is the second of Part III, "Theoretical". This chapter deals simply and solely with the exposition of a pivotal point in the mode of outlook for which I stand, and my adversary cannot therefore complain if I attempt to state it in a more popular form and to make it more coherent.
And there was in fact an extraneous reason for doing this. I had revised three chapters of the book (the first chapter of the Introduction and the first and second of Part III) for my friend Lafargue with a view to their translation into French [13] and publication as a separate pamphlet and after the French edition had served as the basis for Italian and Polish editions, a German edition was issued by me under the title: Die Entwicklung des Sozialismus von der Utopie zur Wissenschaft. This ran through three editions within a few months, and also appeared in Russian [14] and Danish translations. In all these editions it was only the chapter in question which had been amplified, and it would have been pedantic, in the new edition of the original work, to have tied myself down to its original text instead of the later text which had become known internationally.
Whatever else I should have liked to alter relates in the main to two points. First, to the history of primitive society, the key to which was provided by Morgan only in 1877. But as I have since then had the opportunity, in my work: Der Ursprung der Familie , des Privateigenthums und des Stoats (Zurich, 1884) to work up the material which in the meantime had become available to me, a reference to this later work meets the case.
The second point concerns the section dealing with theoretical natural science. There is much that is clumsy in my exposition and much of it could be expressed today in a clearer and more definite form. I have not allowed myself the right to improve this section, and for that very reason am under an obligation to criticise myself here instead.
Marx and I were pretty well the only people to rescue conscious dialectics from German idealist philosophy and apply it in the materialist conception of nature and history. But a knowledge of mathematics and natural science is essential to a conception of nature which is dialectical and at the same time materialist. Marx was well versed in mathematics, but we could keep up with natural science only piecemeal, intermittently and sporadically. For this reason, when I retired from business and transferred my home to London, [15] thus enabling myself to give the necessary time to it, I went through as complete as possible a "moulting", as Liebig calls it, [16] in mathematics and the natural sciences, and spent the best part of eight years on it.
I was right in the middle of this "moulting" process when it happened that I had to occupy myself with Herr Dühring's so-called natural philosophy.
It was therefore only too natural that in dealing with this subject I was sometimes unable to find the correct technical expression, and in general moved with considerable clumsiness in the field of theoretical natural science. On the other hand, my lack of assurance in this field, which Ihad not yet overcome, made me cautious, and I cannot be charged with real blunders in relation to the facts known at that time or with incorrect presentation of recognised theories. In this connection there was only one unrecognised genius of a mathematician a who complained in a letter to Marx [17] that I had made a wanton attack upon the honour of .
